JP2010095728A5

JP2010095728A5 -

Info

Publication number: JP2010095728A5
Application number: JP2009298900A
Authority: JP
Filing date: 2009-12-28
Publication date: 2011-05-19

Claims

A method for producing a phosphor containing at least Ce, La, Si and N ,
(1) Using an alloy containing La and Si as at least a part of the raw material,
(2) Fluorescence containing an element selected from R, M, A, Si, Al, O, and N (provided that R, M, and A are as defined in the following formula [A]) as a raw material, as necessary An alloy for body materials, a simple metal of the element, or a metal compound of the element is mixed with the alloy containing La and Si at a ratio represented by the following formula [A] to obtain a mixture,
(3) A method for producing a phosphor, comprising performing a nitriding treatment step of nitriding the alloy containing La and Si or the mixture .
R _{3-xy-z + w2} M _z A _{1.5x + y-w2} Si _6-w1-w2 Al _{w1 + w2} O _{y + w1} N _11-y-w1 [A]
(In the formula [A],
R represents at least one rare earth element selected from the group consisting of La, Gd, Lu, Y and Sc, and La is essential.
M represents at least one metal element selected from the group consisting of Ce, Eu, Mn, Yb, Pr and Tb, and Ce is essential.
A represents at least one divalent metal element selected from the group consisting of Ba, Sr, Ca, Mg and Zn, and Ca is essential.
x, y, z, w1, and w2 each represent a numerical value in the following range .
0 ≦ x <3
0 ≦ y <2
0 <z <1
0 ≦ w1 ≦ 0.5
0 ≦ w2 ≦ 0.5
0 ≦ w1 + w2 ≦ 5)

(Y + w1) in the formula [A] is less than 1.5.
The method for producing a phosphor according to claim 1, wherein:

(W1 + w2) in the formula [A] is 1 or less
The method for producing a phosphor according to claim 1, wherein the phosphor is produced.

When the composition ratio of Si in the alloy containing La and Si or the mixture used in the nitriding treatment step is 6 mol, the composition ratio of Ca is 1.35 mol or less.
The method for producing a phosphor according to any one of claims 1 to 3, wherein:

An alloy containing La and Si further contains Ce
The method for producing a phosphor according to any one of claims 1 to 4, wherein:

Coexisting flux in the nitriding process
The method for producing a phosphor according to any one of claims 1 to 5, wherein:

The raw material of A in the formula [A] is a nitride.
The method for producing a phosphor according to any one of claims 1 to 6, wherein:

The nitriding step is performed using a hot isostatic press.
The method for producing a phosphor according to any one of claims 1 to 7, wherein:

Containing a crystal phase represented by the following formula [A],
Manufactured using an alloy containing two or more metal elements contained in the crystal phase as at least a part of the raw material,
A phosphor characterized in that an emission spectrum when excited by light having a wavelength of 460 nm satisfies the following formula [B].
R _{3-xy-z + w2} M _z A _{1.5x + y-w2} Si _6-w1-w2 Al _{w1 + w2} O _{y + w1} N _11-y-w1 [A]
(In the formula [A],
R represents at least one rare earth element selected from the group consisting of La, Gd, Lu, Y and Sc;
M represents at least one metal element selected from the group consisting of Ce, Eu, Mn, Yb, Pr and Tb;
A represents at least one divalent metal element selected from the group consisting of Ba, Sr, Ca, Mg and Zn,
x, y, z, w1, and w2 each represent a numerical value in the following range.
(1/7) ≦ (3-x−yz + w2) / 6 <(1/2 )
1 . 5x + y−w2 = 0
0 ≦ x <3
0 ≦ y <2
0 <z <1
0 ≦ w1 ≦ 5
0 ≦ w2 ≦ 5
0 ≦ w1 + w2 ≦ 5)
I (B) / I (A) ≦ 0.88 [B]
(In the above formula [B], I (A) represents the emission intensity at the highest peak wavelength present in the wavelength range of 500 nm to 550 nm,
I (B) represents the emission intensity at a wavelength 45 nm longer than the wavelength of the highest peak. )

Chromaticity coordinates x and y in the CIE standard color system of the emitted color when excited with light having a wavelength of 460 nm are 0.320 ≦ x ≦ 0.600 and 0.400 ≦ y ≦ 0.570.
The phosphor according to claim 9, wherein

The full width at half maximum of the emission peak when excited with light having a wavelength of 460 nm is 100 nm or more.
The phosphor according to any one of claims 9 and 10, wherein the phosphor is characterized by the above.